Hello, maybe this isn't for me then. I spent £20 on 3 seeds for this (failed) experiment. Other than that, it's cost me a bit of time and a bit of electricity. To be honest, I don't think my wife would be too thrilled if I were to invest in lights and equipment for this purpose. All I wanted was a tiny bit of weed to pop in my MFLB on Friday nights. I could go to a local dealer but thought it would be more satisfying to have grown my own.
You're right. There wasn't any perlite in the soil. Just good quality compost.
Thanks everyone, for your input and advice.